I have a class in puppet if I have the following code:
class A {
require B
....
}
I get circular dependencies error. If I have:
class A {
include B
....
}
everything works fine
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2 Answers
21
They are very different things, actually. To say require B means B must come before A (and, therefore, can lead to circular dependencies if something in B turns out to require A). And if B is not included at all, it will lead to missing dependencies error.
On the other hand, include B just says B will be applied whenever A gets applied: it says nothing of the order between them.
Daniel C. Sobral
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Doesn't `require B` actually means that `B` must come before `A`? – Sebastian Krysmanski Sep 22 '19 at 06:28
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@SebastianKrysmanski Uh, yes. :) – Daniel C. Sobral Sep 26 '19 at 17:36
10
This was just asked (and answered) on the puppet mailing list:
The difference is evident when the catalog needs to be applied. With include you have evaluated its contents at the time of the include - but any resources must be depended on explicitly after the include. With a require - the dependency is created for you - but you have to be careful and ensure that this is your desired result
- Ken Barber in Require vs Include?
